Development of the Distribution Model of Pumping and Recharge for Chou-Shui River Alluvial Fan
Date Issued
2012
Date
2012
Author(s)
Lin, Sheng-Ting
Abstract
Chou-Shui River alluvial fan is the agricultural center and emerging industrial area of Taiwan. Surface water has been unable to meet the rising demand, and groundwater has become an important source of water supply. However, groundwater resources should be appropriately managed to avoid land subsidence and other adverse consequences caused by improper pumping. To achieve this goal, we need a well calibrated groundwater numerical model to assess the effectiveness of various management strategies. To establish the numerical model, we must complete the following two tasks: First, utilizing the data fusion technology for groundwater system identification; Second, integrating site survey for clarification of spatial distribution of hydrogeological parameters, recharging, and pumping. Thus, in this study, we present a two-stage procedure to establish a representative groundwater model.
In the first stage, groundwater-hydrograph analysis is applied to evaluate the water balance of Chou-Shui River alluvial fan, and the total quantity of pumping and recharging is obtained. In the second stage, we used MODFLOW as the groundwater flow simulation model to correctly distribute the quantity of pumping and recharging into different space and time. The model establishment process includes aquifer stratification, hydrogeological parameters and boundary conditions setting, pmping and recharging distribution, and groundwater level observation fitting.
The recharging is subdivided into three hydrologic components including rainfall infiltration, river leakage, and groundwater irrigation seepage. The subdivision is implemented according to riverbed materials, soil textures, and cropping systems. The pumping is subdivided into two components including public water supply pumping (involving pumping of both Water Corporation and Irrigation Association) and private pumping. The setting of each pumping is based on official pumping records and pumping well census results.
The results show that, the groundwater resources of Chou-Shui River alluvial fan can be more properly distributed with the detailed settings of pumping and recharging. Furthermore, the quantity of pumping from first shallow unconfined aquifer might be overestimated before; the local pumping behavior in F3 and F4 are not clear, having to add the observation wells and more detailed pumping well census.
Subjects
Pumping Distribution
Recharging Distribution
Chou-Shui River Alluvial Fan
SDGs
Type
thesis
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